Repository: spark Updated Branches: refs/heads/master 1e9781395 -> 9ab296ecd
[SPARK-12520] [PYSPARK] Correct Descriptions and Add Use Cases in Equi-Join After reading the JIRA https://issues.apache.org/jira/browse/SPARK-12520, I double checked the code. For example, users can do the Equi-Join like ```df.join(df2, 'name', 'outer').select('name', 'height').collect()``` - There exists a bug in 1.5 and 1.4. The code just ignores the third parameter (join type) users pass. However, the join type we called is `Inner`, even if the user-specified type is the other type (e.g., `Outer`). - After a PR: https://github.com/apache/spark/pull/8600, the 1.6 does not have such an issue, but the description has not been updated. Plan to submit another PR to fix 1.5 and issue an error message if users specify a non-inner join type when using Equi-Join. Author: gatorsmile <gatorsm...@gmail.com> Closes #10477 from gatorsmile/pyOuterJoin. Project: http://git-wip-us.apache.org/repos/asf/spark/repo Commit: http://git-wip-us.apache.org/repos/asf/spark/commit/9ab296ec Tree: http://git-wip-us.apache.org/repos/asf/spark/tree/9ab296ec Diff: http://git-wip-us.apache.org/repos/asf/spark/diff/9ab296ec Branch: refs/heads/master Commit: 9ab296ecdceef88ebca523ed62848fbeb5df353b Parents: 1e97813 Author: gatorsmile <gatorsm...@gmail.com> Authored: Sun Dec 27 23:18:48 2015 -0800 Committer: Davies Liu <davies....@gmail.com> Committed: Sun Dec 27 23:18:48 2015 -0800 ---------------------------------------------------------------------- python/pyspark/sql/dataframe.py | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) ---------------------------------------------------------------------- http://git-wip-us.apache.org/repos/asf/spark/blob/9ab296ec/python/pyspark/sql/dataframe.py ---------------------------------------------------------------------- diff --git a/python/pyspark/sql/dataframe.py b/python/pyspark/sql/dataframe.py index 4b3791e..ad621df 100644 --- a/python/pyspark/sql/dataframe.py +++ b/python/pyspark/sql/dataframe.py @@ -608,13 +608,16 @@ class DataFrame(object): :param on: a string for join column name, a list of column names, , a join expression (Column) or a list of Columns. If `on` is a string or a list of string indicating the name of the join column(s), - the column(s) must exist on both sides, and this performs an inner equi-join. + the column(s) must exist on both sides, and this performs an equi-join. :param how: str, default 'inner'. One of `inner`, `outer`, `left_outer`, `right_outer`, `leftsemi`. >>> df.join(df2, df.name == df2.name, 'outer').select(df.name, df2.height).collect() [Row(name=None, height=80), Row(name=u'Alice', height=None), Row(name=u'Bob', height=85)] + >>> df.join(df2, 'name', 'outer').select('name', 'height').collect() + [Row(name=u'Tom', height=80), Row(name=u'Alice', height=None), Row(name=u'Bob', height=85)] + >>> cond = [df.name == df3.name, df.age == df3.age] >>> df.join(df3, cond, 'outer').select(df.name, df3.age).collect() [Row(name=u'Bob', age=5), Row(name=u'Alice', age=2)] --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@spark.apache.org For additional commands, e-mail: commits-h...@spark.apache.org
